The computer models have converged, and they agree on a storm track that will keep most of the rain to the south of Long Island. The 2 to 4 inch rain amounts will be confined mostly to the Maryland/ Delaware region. Long Island will only be skimmed by the storm with rainfall totals of only about a half inch for southeastern Suffolk, and even lower amounts for northwest Nassau. Most of the rain that does fall will occur between midnight and 10 AM on Saturday, and there will still be wind gusts up to 30 mph.
Sunday and Monday look partly to mostly sunny with temperatures close to 80 degrees, but an isolated shower still cannot be ruled out at this time. Tuesday through Tuesday will be noticeably warmer and mostly sunny with temperatures in the mid 80's and higher levels of humidity by Wednesday and Thursday.
The following image shows expected rainfall through tomorrow night from the GFS model:
Image from tropicaltidbits.com